delany



P. B.VDELANY SOUND REPRCDUGING DEVICE Original Fil'edy Feb. 1, 1918 3Sheets-Sheet ,L

Nv.`3,1925.' y Re. 16,197

' l P. B. DELANY SOUND REPRODUClNG DEVICE I5 Sheets-Sheet 2 OriginalFiled Feb. 1, 1918 Nov.. 3l 1925. Re. 16,197

y P. B. DELANY SvOUND REFRODUCING DEICE Original Fil-.gd Feb. l,

3 Sheets-Sheet 3A Novi/i3.,

" UNITED. STATES PATENT ourlet-1'.

rA'riucx n. DELA, or SOUTH ORANGE, Naw JERSEY; JAMES n. minuutv Exncuron0F SAID PATRICK n. DELANY,'DEcnAsED.

SOUND-REPBQDUCING DEVICE.

Original No. 1,415,807, dated Hay 9, 1922,*Seria1 No. 214,931,1l1edFcbruary-1, 1918. Application for reissue lcd July 8, 1923. Serial No.850,482.

To all whom it may concern.:

Be it known that I, PATRICK B. DELANY, a citizen of the United States,residing at South Orange, in the county of Essex and `State of New Jersey,'have invented certain new and useful Improvements in Sound-Reproducing Devices, of which the follow? ing isa specification'.

My invention 'relates generally to sound reproducing apparatus and moreparticularly to devices for electrically vreproducing the sounds reducedby a phonograph or the like in a istant telephone receiver.

I am aware that the telephonic transmisfailure of the current flowingthrough the microphone to clearly' and faithfully reproduceinpiteh andquality the sounds intended to be transmitted.` On the other Y, hand thewell-known characteristic of the g microphone whereby it magnifies mereloudznes's results in an undue 'exaggeration of the f 3.0

extraneous noises produced y the scraping of the needle 'and theoperationiof the motor and other mechanical parts. These effectscannotbe avoided where a microphone is used as a transmitter and, in addition,the

' action of mechanical vibration on the carbon granules of thetransmitter also vproduces effects apart from those derived froml thesound record. It follows that the microph0ne,from the nature of itsconstruction, cannot be relied upon to reproduce al single, true tonesung into it, or to render the tone twice alike, -owing to the fact thatalmost! invariably the vibrations of the first tone will cause arearrangement of the .carbon granules which will varythe conductivity ofthe circuit in which the microphone is included. This will, of course,result in corresponding variation in the pitch and quality of the tonebeing rendered. In this way a single tone of a few seconds duration willbe subject to a number of changes which will prevent its correctreproduction. The object of this invention is to provide -a directly1sound reproducing device of this general nature in which thedisadvantages referred to are eliminated.

By experimentation I have found that for pure reproduction of-musicalsounds by telephone the transmitterfshould be of the magi neto type ,andthat it is most etlicient when connected to the tone arm or emitterchannel of the machine, so that the iron dia-A phragm of the transmittershall be vibrated by the sound vibrations passing throug the armor-horn. The chief characteristics of magneto t pe transmitter are thatit includes'a diap ragm of magnetic material-'which is caused to vibratebythe action of sound waves in the magnetieeld 4of a permanent magnet. Acoil mounted on the magnet will, accordingto the wellknown law relatingto induction currents,

havealternating current impulses generated therein, corresponding to thevibrationsof Y. y

the diaphragm, so that the magneto ,transmitter actsas a generatorofelectricity. As has been already indicated, ithas been found that thecurrents are undulated by the vibratory approach .and withdrawal of thdiaphragm-armature of the magnet of the magneto electric generator. Inthe present .case the currentsV thusgenerated ahnost perfectly representin pitch and in quality the 'sounds .striking the diaphragm and causestheir reproduction in the corresponddistinctness Since the quantity ofelectricity generatedby the magneto transmitter is of necessityv Ausedin railway stations and other public places, a function not contemplatedin this mvention. The objecthereln sought 1s ,ratherthe refined andaccurate reproduc- A ing receiver with remarkableclearness and .tionof'm'usical and other soundswithin thel comparatively restrictedboundaries of a town, or from one room of a dwelling or other buildingto lanother l'n homes, hospitals and sanitariums where invalids,especially those suffering from nervous troubles, could not endure theblare and action of music produced immediately in'their presence, wouldderi-ve grateful entertainment and muchbeneticial mental abstractionfrom ation lwith other people.

It willbe evident that the advantages of a system of this kind may behad in other situations than the particular ones named.

'For instancefmusic-dealers will be enabled to permit theii' =customersto listen ovei' the telephones in their own homes to the playingofrecords in the dealers sliep. This can be effected by hanging thesmall receiver'of the apparatus -over the mouthpiece of -the telephonetransmitter in the shop,

\ so that the customer can judge of the merits of the record beingplayed, through thereceiver athis end of the regular telephone circuit.rlhe rese-nce ofthe carbon microf phone transmitter in the tele honecircuit,I

oes n ot have with such an arrangement, the harmful influence `on. the,rendering of musical tones that it would have if mounted directly o nthe tone arm in the local circuit,

where it would be subjected to vmechanicalv vibration, as alreadpointedl out. As a result, the reproduction of the sounds, even throughthe intermediary of an ordinary telephone circuit containin a carbonmicrophone transmitter, is faith ul and agreeable. Other features of theinvention vwill be hereinater described.

Figuresl is a view showing an embodiment of the invention in whichthemagneto transmitter is directly mounted on the tone arm of a suitablesound reproducing instrulnent.- l l Figure 2 shows an embodiment of theinvention in which the transmitter'is inoiuit'- ed on an auxiliary soundbox Ycarried by the tone arm;

Figure 3-is a detailed view of the magneto transmitter included incircuit .with a, tele- Y phone receiver.

,niounte Figure 4 is a view similar'to Figure 3 and showin the receiverinthe local circuit on the` mouthpiece of a telephone two magnetotransmitters mounted on a common tone arm aiid connected in parallel inthesamelocal circuit.

Figure 6 is a View showing 'a magneto transmitter and sound box combinedinto a single device.r.,.

Figure'Z-'isffa view of a-moditied form of transmitter in' which adouble isemployed. l

Figure 8 is a view showingr two 11ansinitters mounted on the tone armand two independent local circuits corresponding to the twotransmitters.

Figure'9 is a view showing an'arrangement for securing duplicatereproduction from a single transmitter with a pair of receiversconnected in multiple.

In Figure 1 of the drawing there is shown a preferred embodiment of theinvention in which a telephone transmitter 1 of the mag'-neto-instrument type is mounted on the tone arm' 2 of any suitable soundreproducing Preferably. the transmitter 1 is mounted ad- /jacentthe'enlarged en d 3 of the tone 'arm fin order to securethe greatestpossible amplitudeof vibration ofthe transmitter diaphragm through theaction thereon of the vibrating column of airin the progressivelyexpanding tubular tone arm 2. Carried at the smaller end 4 of the tonearm is a sound box 5 of any suitable type and adapted to be operatedthrough the engagement of. the stylus 6 with the record groove of thesound iecord in the usual manner.

The-'specific construction of the transmitter- 1 is best shown in Figure3 in the pole magnet form of a watch-case type/of instrument the edge oftheframe member 8 and to 4be forcedagainst a suitable'gasket 12 byturning the member' Shinto place. The diaphragm 11 when s-mou'nted bearsa cooperative relation tothe adjacent pole of the magnet, as will 'beseen. lmember 10 is 4.provided with an opening 13 surrounded bya flange14 which is adapted to be slipped into place on a correspondingfla-nge'l formed about'the edge. of an opening-inthe sideof the tone arm2. -t will 'be seen that-vibrations set up in the air column with-in thetone armhy the mechanic-alri- 'bration ofthe diaphragm in tli'e soundbox 5 will l'e communicated directly to the diaphragm 11` ofthetransmitter 8.

it willbe-obvious that the `movement of the vibrating diaphragmV in themagnetic a transmitter to Areproduce sounds at a `ds'gfield'ot thepermanent magnet 7 will induce tance.

. undulating current fluctuations in` a coil -16 Figure 5 is .a viewshowing the use of. on the magnet 7. In order to utilize the l Thesupporting .1 i t b @hierheen foundtoereatlyfim men' of ivhielrtliesound current. thus produced, a telephone receiver tli is coopem'tlvthis typez 'o`f `apparvzitusvperfectly" reproduces "the Asounds producedby the 'record w'v'ithout any deterioration vin plteh or quality; finstriking contrast' to tliej 1esults" iittained by v:the microphonicdevices heretofore used for -tlus purpose.

" 'In Figure 2 ofthe fdrzrwing Ais s hown'a modification vfvliicl-iv@Supplementalfsoinvd box 2.5 15 'interposedbetiveen the tone'ari'n z 'lis mn n't'eill4 agldiitplirafg'ni l either of a.' fine- @1110i er? fr27' therein. Samir/f freA I5 ofthe tone arm,

fthe; trai mittergl, in :m o b rece r'f1'7 can befre" mounted. on thetone arm and in which a.

unibet efumeen l Simmel edi-img polelhagneues; rimedi-@st 7 'und 7 :indthe coils' ljfand Obviou'sly nmltiple-pole devices embodying in greater'I polescrli'be nmrlc usefof f "uire s'. 100 In Figure .58` is ,shown 2iAmodi catio in which tivo sepzirite `tra'nsmitters'. l and 1'] areiniountcdontlie tone farm 2.. .Col-operating Witli =,tlie,\ t;r:ii1 s'lzind 1Q are .the ein'- i A und 1,7",4. and the con- ,nectnef-Qiltfutes 23 24mm 23:-24, respective-ly. this @rangement fzi nui- 1tjele were@chiome@ be' f semd.- edinb- .vously ,ille me n-umbenef; .Denen-liteeneeedmgflOw-lCircuits 1nd 11 :receivers-Ii..anfibef-.empleyedviff..desi1:ed I 111:; Eisma rissheue an errag'emntjfm 11H11- ,tpleireprefllwt'n iin ivheh' :af Smrlehfans- :ntterflirsfnseds-mcemhinntenfiwith allurality of receivers l. nnd,. 17 fconncctedinmultiple v i1; lr,.tlxe singletragnsmitteng- It.willethi'isbeseenFthatffinfthe described '.nventionlfpmvisiee gis.erede or the refined and incurete :lieuxufl-1:1@bieniA etphonographically produedseundsat a :diste-nce, ndthat provided :b vimeansiotf .whehf lpersons outside thegimmediat @mitvof. the phonographcian; have the-benefit ing air column in the tone arm for theiractuation but, in addition, they havenot been used tov control aplurality of telephone receivers at a distance.

It willbe observed that the o ening or orifice 13 in the tone arm-bywhic communication is established between the-interior l of the tone armand the telephone transmitis not directly opposite the sound box.

While as before stated superior results are obtained when a magnetotransmitter is employed so far as son-1e features of construction hereinlshown and described are concerned a microphonic transmitter might beused. A

In the claims where I specify a tubular sound directing member I referto a tone arm-of usual construction and not to a conduit of indefinitelength.

I claim as my invention:

' 1. A 'sound reproducing device comprisingza sound reproducinginstrument having a ltubular sound wavev directing member,a telephonetransmitter ofthe currentgenerating type mounted on the side. of saidtubular member in'position to be actuated by sound wave disturbanceswithin saidv member, and a telephone circuit within which saidtransmitter is included.

2. A sound reproducing device com rising: a sound reproducing instrumentaving a tone arm, a telephone transmitter of the magneto type mountedonthe side of said arm and having its diaphr in communication with theinterior o said arm, and a telephone circuit within vwhich said'transmitter is included.

3. A sound reproducing device com rising: a sound reproducing instrumentaving a tone arm, a telephone transmitter of the magneto type mounted onthe side wall of said arm with its diaphragm in communication with theinterior of said arm, and a telephone circuit within which saidtransmit-ter is included.

4.- A sound reproducing device comprisl1am? ing: a sound reproducininstrument having a, tone arm, a plura ity of telephone transmitters ofthe magneto type mounted on the side wall of said arm in oppositelydisposed positions and with their diaphragms in communication with theinterior of said arm, a circuit-within which saidl the side wallthereof, and a telephone transmitter of the magneto ty mounted on saidtubular member 'with t e central portion -of its diaphragm in positionto b e affected by sound vibrations emanating from- -the interior-ofsaid tubular directlng member through said restricted orifice.

6. *A sound reproducing device comprising: a sound reproducinginstrument having a tubular sound directing member provided withoppositely disposed orifices of restricted size in the side wallthereof, and telephone transmitters of the magneto type 'mounted on saidtubular member with the central portions of the diaphragms thereof inposition to be affected by sound waves emanating from the interior ofsaid tubular directing member` through said. restricted orifices.

- 7. A device for electricaltransmission of sound comprisin a soundreproducing .instrument, a tubu ar amplifying member for locally.directing and distributing sounds produced -by said instrument, a.-magneto telephone transmitter havingits diaphragm exposed to sound wavesin said tubular member intermediate the ends thereof, and a telephonecircuit including said transmitter for electrically reproducing thesounds at a. distance. y

8. A. device for the electrical transmission ofsound comprising: a soundreproducing instrument, a. tubular member for localliv directing anddistributing sounds prouced by said instrument, a ma eto telephonetransmitter having its ila hragm mounted substantially parallel to t eaxisl of said tubular member and exposed to sound waves in said memberintermediate' the ends thereof, and a telephone circuit including saidtransmitter for electrically reproducing the sounds at a distance.

In testimony whereof vI subscribed my naine.

PATRICK B. DELAN Y.

have hereunto

